IMX6 gpio: trivial clean up.
IMX6 gpio: trivial clean up.

agacek/util_libs,agacek/libplatsupport,winksaville/libplatsupport,agacek/libplatsupport,seL4/libplatsupport,winksaville/libplatsupport,agacek/util_libs,agacek/util_libs,seL4/libplatsupport,agacek/util_libs